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Primary Stability Determination of Implants Inserted in Sinus Augmented Sites: 1-Step Versus 2-Step Procedure

Degidi, Marco MD, DDS*; Daprile, Giuseppe DMD; Piattelli, Adriano MD, DDS

doi: 10.1097/ID.0b013e31829f1ef2
Basic and Clinical Research

Objectives: The aim of this study was to evaluate the primary stability of implants placed immediately after a sinus lift, compared with implants placed in the area treated with a sinus lift 6 months before.

Material and Methods: Patients with a residual bone height of at least 4 mm were treated with a 1-stage procedure (group A) and patients with a residual bone height < 4 mm with a 2-stage approach (group B). Sinus lift was always performed with 50% autogenous bone and 50% deproteinized bovine bone mineral. Data recorded included maximum insertion torque (IT), resonance frequency analysis (RFA) values, and bone density, length, and diameter. It was recorded whether an implant was removed within 6 months after insertion.

Results: Fourteen patients were included in group A and 16 patients in group B; 96 implants were inserted. Mean IT was 23.77 ± 12.63 N·cm in group A and 26.48 ± 20.80 N·cm in group B. Mean RFA was 65.25 ± 4.45 implant stability quotient (ISQ) in group A and 67.92 ± 10.99 ISQ in group B. No statistically significant differences were found. All implants were osseointegrated.

Conclusions: The results show that the implants studied can obtain a sufficient primary stability in both clinical situations without statistically significant differences.

*Private Practice, Bologna, Italy.

Private Practice, Bologna, Italy.

Full Professor, Department of Medical, Oral, and Biotechnological Sciences, University of Chieti-Pescara, Chieti, Italy.

Reprint requests and correspondence to: Adriano Piattelli, MD, DDS, Department of Medical, Oral, and Biotechnological Sciences, University of Chieti-Pescara, Via F. Sciucchi 63, 66100 Chieti, Italy, Fax: 011-39-0871-3554076, E-mail:

© 2013 by Lippincott Williams & Wilkins, Inc.